Emissions System & Component Test Parameters
EVAP SYSTEM OPERATION
| Components & Conditions |
Specification |
| Ignition Switch Off |
| Coolant Temp. |
N/A |
| Thermo Temp. |
N/A |
| Engine RPM |
N/A |
| Throttle Position Switch |
N/A |
| VSV |
N/A |
| Canister Check Valve |
|
N/A |
|
N/A |
| Check Valve In Fuel Filler Cap |
N/A |
| Evaporation Fuel (HC) |
HC from tank & float chamber is absorbed into the canister |
| Ignition Switch On, High vacuum in tank |
| Coolant Temperature |
N/A |
| Thermo. Temperature |
N/A |
| Engine RPM |
N/A |
| Throttle Position Switch |
N/A |
| VSV |
N/A |
| Canister Check Valve |
|
Closed |
|
Open |
| Check Valve in Fuel Filler Cap |
Open |
| Evaporation Fuel (HC) |
Air is led into the tank |
CARBURETOR FEEDBACK SYSTEM OPERATION
| Components & Conditions |
Specification |
| Coolant Temp. Below 63°F (17°C) |
| TVSV |
Open (K-L) |
| Condition |
N/A |
| Deceleration - Engine RPM |
Above 1500 RPM |
| TPS |
Off |
| Vacuum Switch |
On |
| Air Fuel Ratio in the Exhaust Manifold |
N/A |
| O2 Sensor Signal |
N/A |
| Computer |
On |
| EBCV |
Open |
| Air Bleed |
On |
DECELERATION FUEL CUT-OFF SYSTEM OPERATION
| Components & Conditions |
Specification |
| Engine RPM Less than 1600 RPM |
| Throttle Position Switch |
On |
| Computer |
Off |
| Primary Fuel Cut Solenoid Valve |
On |
| Slow Circuit in Carburetor |
Open |
| Engine RPM More than 2000 RPM |
| Throttle Position Switch |
Off |
| Computer |
Off |
| Primary Fuel Cut Solenoid Valve |
Off |
| Slow Circuit in Carburetor |
Closed |
COLD MIXTURE HEATER OPERATION
| Components & Conditions |
Specification |
| Ignition Switch Off Engine Not Running |
| Coolant Temp. |
N/A |
| Thermo Switch |
N/A |
| ECM |
N/A |
| CMH Relay |
Off |
| CMH |
Off |
| Ignition Switch On Engine Not Running |
| Coolant Temp. |
N/A |
| Thermo Switch |
N/A |
| ECM |
Off |
| CMH Relay |
Off |
| CMH |
Off |
| Ignition Switch Off Engine Running |
| Coolant Temp. |
Below 109°F (43°C) |
| Thermo Switch |
On |
| ECM |
On |
| CMH Relay |
On |
| CMH |
On (Heated) |
| Ignition Switch On Engine Running |
| Coolant Temp. |
Below 109°F (43°C) |
| Thermo Switch |
On |
| ECM |
On |
| CMH Relay |
On |
| CMH |
On (Heated) |
| Ignition Switch On Engine Running |
| Coolant Temp. |
Above 131°F (55°C) |
| Thermo Switch |
Off |
| ECM |
Off |
| CMH Relay |
Off |
| CMH |
Off |